Multi-channel transmitter for coherent udwdm networks and method for generating a multi-channel signal

摘要

In a multi-channel transmitter are high speed elements, especially a digital-analog-converter, substituted by preferable analog multipliers (9) and an analog summer (2). Modulated baseband signals (I, Q) are converted into wavelength division signals (WDS) with higher carriers and combined by the analog summer (2) to a modulation signal (ΣI(t), ΣQ(t)) which is fed to an optical modulator (7). Low-pass filters (8, 10; 3, 4) avoid unwanted signal spectra.